The utility model discloses a turnover machine for full automatic turnover of a corrugated paper stack. The turnover machine comprises a mounting frame, a support frame, a conveying mechanism and a rotary mechanism, wherein the mounting frame and the support frame are respectively arranged at the two sides of the conveying mechanism, the conveying mechanism comprises an upper conveying belt and a lower conveying belt, a rotary cam is arranged between the upper conveying belt and the lower conveying belt, the rotary mechanism comprises a rotary frame, rotary shafts and a rotary motor, the rotary frame is respectively connected with the support frame and the mounting frame, the rotary shafts are positioned at the two sides of the rotary frame, and the rotary motor is arranged on the mounting frame. The turnover machine has the advantages that the turnover mechanism and the conveying mechanism are integrated, so the turnover and conveying efficiency is greatly improved; by expanding openings in the charging and discharging processes, the blockage of the warped corrugated paper stack is effectively avoided, the bent corrugated paper can be flattened in the turnover process, and the scattering of the corrugated paper stack in the turnover process is avoided.